Automotive Circuits

Here you'll find nice applications on realistic automotive circuits. The type of circuits that cars love. These automotive circuits presents several unique challenges to design and test engineers. One of these challenges is prevalence of multiple technologies in automotive systems. Automotive projects demonstrates how a mixed-technology can be applied to automotive systems, both for design analysis and testing. Find just everything about automotive circuits that you can build without so special knowledge about electronic circuits. Some of those automotive circuits are: Volt DC Converters, Brake lights, Engine Tachometers, Windscreen Wiper Control, automotive alarms, Capacitor Discharge Ignition Circuits, Car Clocks, electronic parking aids, Car Battery Chargers, and many more.

Automotive Alarm	Parking Aids	Car bike Circuits
Lighting	Audio

Ice warning and lights reminder

This device will tell a driver if his lights should be on and will wam him if the outside temperature is nearing zero by lighting a LED and sounding a buzzer9 VR1 adjusts sensitivity and LDR should be well protected..

Digital Pressure Gauge

Using an intersil ICL 7106 A/D converter chip and an LED display module, this gauge uses a Sensym Corp. pressure tra..

Speed alarm

Pulses from the distributor points are passed through a current limiting resistor, rectified, and clipped at 4 volts. Via Q1 and the diode pump, a dc voltage proportional to engine rpm is presented to RV1; the sharp transfer characteristic of a CMOS gate, assisted by feedback, is used to enable the oscillator formed by the remaining half of the 4011..

Flashing Brake Light Circuit

When power is first applied, three things happen: the light-driving transistor (Ql) is switched on because of a low output from U2, pin 3; timer Ul begins its timing cycle, with the output (pin 3) going high, inhibiting U2`s trigger (pin 2) via D2; and charge current begins to move through R3 and R4 to CI.When Ul`s output goes low, the inhibiting bias on U2 pin 2 is removed, so U2 begins to oscillate, flashing the third light via Ql, at a rate determined by R8, R6, and.....

Auto battery current analyzer

This op-amp analyzer can measure the current drawn by any device in a car. The analyzer works by measuring the very small voltage that develops across the battery cables when current flows..

Headlight Alarm Circuit

The base of Ql is connected to the car`s ignition circuit; the easiest point to make that connection is at the ignition switch fuse in the car`s fuse panel. Also, one side of the piezoelectric buzzer is connected to the instrument-panel light fuse; when the headlights or parking lights are on, the instrument panel is lit, too. When the headlights are off, no current reaches the buzzer. Therefore, nothing happens. What happens when the headlights arc on depends on the.....

Courtesy-light-delay-switch

This circuit holds on the internal light for approximately one minute after the car doors are closed. When the door contacts open, a + VE pulse is applied to the base of Tl. This transistor turns on, turning off T2 and charging the 10-llF capacitor. T3 turns on, holding on the internal light. ..

Car Headlight Control

It is annoying to realize that you have left your car headlights on only to find that the battery is flat. One possib..

Automobile Lights-On Reminder

The circuit can be used to give a visible or an audible warning that the headlights are on. It uses a 2N1305 ..

Voltage Gauge

This circuit uses an RCA CA3162E (IC2) A/D converter. This converter has 12-bit output (BCD) which is sent to display decoder..

Alternator Regulator Circuit

This alternator regulator uses a 3-transistor dc amplifier, and is designed for a pulled up field system, where one side of the alternate field returns to the +12-Vsupply, and the other end is pulled toward ground...

Car windshield wiper delay

The circuit provides a windshield wiper delay, dynamic braking and windshield wipers when they reach the rest position. This prevents the blades passing, which could lead them to stop at a point where they interfere with the vision of drivers. With the original wiper switch off, switch turns on the MLS delay circuit and disconnects the wiring SIB from automobiles. When SI is turned off, the original wiring system and controls the delay circuit is bypassed. ..

Car battery monitor III

The circuit is quick and easy to put together and install, and tells you when battery voltage falls below the set limit as established by Rl (a 10,000-ohm potentiometer). It can indicate, via LED 1, that the battery may be defective or in need of change if operating the starter causes the battery voltage to drop belciw the present limit. ..

Electronic-car-horn

An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U1 produces the upper frequency signal of about 200 Hz, while the second oscillator, pins 8 to 13, provides the lower frequency signal of about 140Hz. Increase or decrease the frequencies by changing the values of C2 and C3. U1"s outputs, pins 9 and 5, are connected to separate potentiometers to provide control.....

Overspeed indicator

An op-amp comparator is used to compare the converter output with a dc threshold voltage. The circuit flashes the LED when the input frequency exceeds 100 Hz. Increases in frequency raise the average current out of terminal 3 so that frequencies above 100 Hz reduce the charge time of C2, increasing the LED flashing rate..

Automobile-locater

This locater is made up of two parts. The first is an rf oscillator, whose circuit is shown in Fig. 8-4a. The second is a sensitive receiver shown in Fig. 8-4b. The heart of the oscillator is a 555 timer !C. Tank circuit C2 and L1 is used to tune the transmitter. The antenna is coupled to the transmitter through C3. A telescopic antenna or a length of hookup wire will work quite well. At the receiver, the incoming signal is tuned by C5 and L2 before being passed on to.....

Wiper speed controller

The relay which applies power to the wiper motor is actuated at periodic intervals by the timer circuit, closing the wiper motor contacts. Potentiometer R1 serves as the pulse rate control and potentiometer R5 as the pulse width control. ..

Courtesy-light-extender

The circuit keeps the courtesy light on for 30 seconds after you close the door. The lead from the door switch is removed and connected to the 555 circuit. The 555 is arranged in a monostable mode, and is triggered by the door switches. The output drives Ql, which is connected across the interior light switch. The interior light is turned on for 30 seconds after the door is opened. If the door(s) are held open for longer than 30 seconds, it will not reset until after.....

Automobile-ignition

The ignition substitute provides a constant power source for the ignition coil. Its frequency, 0.5-1.0 kHz, is that used by an 8-cylinder engine with an idling speed of 650 RPM, and the unit provides a rapid spark at a 17% duty cycle, while staying within the power dissipation limits of the components. The circuit consists of a 555 timer IC configured as an astable free~running multivibrator that is used to drive a high-current npn transistor, such as a 2N6384. The.....

Auto Turn-Signal Reminder Circuit

This circuit counts turn signal flashes. At the end of about 70 flashes, a chime sounds to remind the driver to turn off the turn signal. By using various taps on U2, the period can be changed if desired...